Grammars:

• fix(csharp) add missing catch keyword (#3251) Konrad Rudolph
• add additional keywords to csp.js (#3244) Elijah Conners
• feat(css) handle css variables syntax (#3239) Thanos Karagiannis
• fix(markdown) Images with empty alt or links with empty text (#3233) Josh Goebel
• enh(powershell) added pwsh alias (#3236) tebeco
• fix(r) fix bug highlighting examples in doc comments Konrad Rudolph
• fix(python) identifiers starting with underscore not highlighted (#3221) Antoine Lambert
• enh(clojure) added edn alias (#3213) Stel Abrego
• enh(elixir) much improved regular expression sigil support (#3207) Josh Goebel
• enh(elixir) updated list of keywords (#3212) Angelika Tyborska
• fix(elixir) fixed number detection when numbers start with a zero (#3212) Angelika Tyborska
• fix(ps1) Flag highlighted incorrectly (#3167) Pankaj Patil
• fix(latex) Allow wider syntax for magic comments (#3243) Benedikt Wilde
• fix(js/ts) Constants may include numbers Josh Goebel